Abstract: After studying the existing detector generating algorithms used in the intrusion detection systems, a new approach of detector generating was presented which was based on chaos theory.The over-spread character of chaos sequence combined the concept of weighted Euclidean distance was used to generate set of detector with better distribution, and chaos initial value sensitivity was used to enlarge the searching space.Simulation experiment and the results indicate that the arithmetic not only remains the diversity of population but also has good fast astringency.